// Copyright 2019-2024 Xu Ruibo (hustxurb@163.com) and Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package sync2

import "sync"

type Future struct {
	sync.Mutex
	wait sync.WaitGroup
	vmap map[string]interface{}
}

func (f *Future) lazyInit() {
	if f.vmap == nil {
		f.vmap = make(map[string]interface{})
	}
}

func (f *Future) Add() {
	f.wait.Add(1)
}

func (f *Future) Done(key string, val interface{}) {
	f.Lock()
	defer f.Unlock()
	f.lazyInit()
	f.vmap[key] = val
	f.wait.Done()
}

func (f *Future) Wait() map[string]interface{} {
	f.wait.Wait()
	f.Lock()
	defer f.Unlock()
	f.lazyInit()
	return f.vmap
}
